tools/perf/arch/arm64/util/pmu.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <internal/cpumap.h>
   4 #include "../../../util/cpumap.h"
   5 #include "../../../util/pmu.h"
   6 #include <api/fs/fs.h>
   7 #include <math.h>
   8
   9 static struct perf_pmu *pmu__find_core_pmu(void)
  10 {
  11         struct perf_pmu *pmu = NULL;
  12
  13         while ((pmu = perf_pmu__scan(pmu))) {
  14                 if (!is_pmu_core(pmu->name))
  15                         continue;
  16
  17                 /*
  18                  * The cpumap should cover all CPUs. Otherwise, some CPUs may
  19                  * not support some events or have different event IDs.
  20                  */
  21                 if (pmu->cpus->nr != cpu__max_cpu().cpu)
  22                         return NULL;
  23
  24                 return pmu;
  25         }
  26
  27         return NULL;
  28 }
  29
  30 const struct pmu_events_table *pmu_events_table__find(void)
  31 {
  32         struct perf_pmu *pmu = pmu__find_core_pmu();
  33
  34         if (pmu)
  35                 return perf_pmu__find_table(pmu);
  36
  37         return NULL;
  38 }
  39
  40 double perf_pmu__cpu_slots_per_cycle(void)
  41 {
  42         char path[PATH_MAX];
  43         unsigned long long slots = 0;
  44         struct perf_pmu *pmu = pmu__find_core_pmu();
  45
  46         if (pmu) {
  47                 perf_pmu__pathname_scnprintf(path, sizeof(path),
  48                                              pmu->name, "caps/slots");
  49                 /*
  50                  * The value of slots is not greater than 32 bits, but sysfs__read_int
  51                  * can't read value with 0x prefix, so use sysfs__read_ull instead.
  52                  */
  53                 sysfs__read_ull(path, &slots);
  54         }
  55
  56         return slots ? (double)slots : NAN;
  57 }